Which force vector B below could be added to force vector A to produce resultant vector R?

4 A golf ball is propelled with an initial velocity of 60. meters per second at 37° above the horizontal. The horizontal component of the golf ball’s initial velocity is

(1) 30. m/s(2) 36 m/s(3) 40. m/s(4) 48 m/s

5 Which object has the greatest inertia?

(1) a 1.0-kilogram object moving at 15 meters per second(2) a 5.0-kilogram object at rest(3) a 10.-kilogram object moving at 2.0 meters per second(4) a 15-kilogram object at rest

6 A 3-newton force and a 4-newton force are acting concurrently on a point. Which force could not produce equilibrium with these two forces?

(1) 1 N(2) 7 N(3) 9 N(4) 4 N

Refer to the following information for the next two questions.

The diagram shows the top view of a 65-kilogram student at point A on an amusement park ride. The ride spins the student in a horizontal circle of radius 2.5 meters, at a constant speed of 8.6 meters per second. The floor is lowered and the student remains against the wall without falling to the floor.

7 Which vector best represents the direction of the centripetal acceleration of the student at point A?

8 The magnitude of the centripetal force acting on the student at point A is approximately

(1) 1.2 × 104 N(2) 1.9 × 103 N(3) 2.2 × 102 N(4) 3.0 × 101 N

9 A 60-kilogram student jumps down from a laboratory counter. At the instant he lands on the floor his speed is 3 meters per second. If the student stops in 0.2 second, what is the average force of the floor on the student?

(1) may be zero or negative(2) may be zero or positive(3) must be negative(4) must be positive

11 Which diagram best represents the gravitational field lines surrounding Earth?

12 A 2.0-kilogram block sliding down a ramp from a height of 3.0 meters above the ground reaches the ground with a kinetic energy of 50. joules. The total work done by friction on the block as it slides down the ramp is approximately

(1) 6 J(2) 9 J(3) 18 J(4) 44 J

13 A person weighing 6.0 × 102 newtons rides an elevator upward at an average speed of 3.0 meters per second for 5.0 seconds. How much does this person’s gravitational potential energy increase as a result of this ride?

(1) 3.6 × 102 J(2) 1.8 × 103 J(3) 3.0 × 103 J(4) 9.0 × 103 J

14 The potential energy stored in a compressed spring is to the change in the spring’s length as the kinetic energy of a moving body is to the body’s

(1) speed(2) mass(3) radius(4) acceleration

15 The diagram below shows an ideal simple pendulum.

As the pendulum swings from position A to position B, what happens to its total mechanical energy? [Neglect friction.]

(1) It decreases.(2) It increases.(3) It remains the same.

16 During an emergency stop, a 1.5 × 103-kilogram car lost a total of 3.0 × 105 joules of kinetic energy. What was the speed of the car at the moment the brakes were applied?